61. The floor is rubbed with oxalic acid, for making its surface
62. The vertical sides of a door and window openings provided in a wall, are known as
63. Cavity wall is generally provided for
64. In soils possessing low bearing capacity, the type of foundation generally provided, is
65. Exposed portions of vertical surface at right angles to the door or window frame, are known as
66. The concrete slump recommended for beams and slabs; is
67. The bearing capacity of a water logged soil can be improved by
68. The type of arch used for high class buildings where appearance is of prime importance, is known as
69. The window which projects outside a room of a building for admitting more light and air, is known
70. If the depth of an excavation is 20 meters, number of single stage well points to be installed at various levels, is
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